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Risk Management and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2017
Derivative [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of the Company's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):
 
Other
 
 
 
Other
 
Other
 
 
 
Current
 
Other
 
Current
 
Long-term
 
 
 
Assets
 
Assets
 
Liabilities
 
Liabilities
 
Total
As of June 30, 2017
 
 
 
 
 
 
 
 
 
Not designated as hedging contracts:
 
 
 
 
 
 
 
 
 
Commodity assets(1)
$
22

 
$
88

 
$
5

 
$
1

 
$
116

Commodity liabilities(1)
(4
)
 
(1
)
 
(55
)
 
(139
)
 
(199
)
Interest rate assets
12

 
—

 
—

 
—

 
12

Interest rate liabilities
—

 
—

 
(4
)
 
(7
)
 
(11
)
Total
30

 
87

 
(54
)
 
(145
)
 
(82
)
 
 

 
 

 
 

 
 

 
 
Designated as hedging contracts:
 

 
 

 
 

 
 

 
 
Commodity assets
—

 
—

 
2

 
6

 
8

Commodity liabilities
—

 
—

 
(13
)
 
(16
)
 
(29
)
Interest rate assets
—

 
6

 
—

 
—

 
6

Interest rate liabilities
—

 
—

 
(2
)
 
(1
)
 
(3
)
Total
—

 
6

 
(13
)
 
(11
)
 
(18
)
 
 

 
 

 
 

 
 

 
 
Total derivatives
30

 
93

 
(67
)
 
(156
)
 
(100
)
Cash collateral receivable
—

 
—

 
20

 
64

 
84

Total derivatives - net basis
$
30

 
$
93

 
$
(47
)
 
$
(92
)
 
$
(16
)
 
 
Other
 
 
 
Other
 
Other
 
 
 
Current
 
Other
 
Current
 
Long-term
 
 
 
Assets
 
Assets
 
Liabilities
 
Liabilities
 
Total
As of December 31, 2016
 
 
 
 
 
 
 
 
 
Not designated as hedging contracts:
 
 
 
 
 
 
 
 
 
Commodity assets(1)
$
42

 
$
86

 
$
5

 
$
2

 
$
135

Commodity liabilities(1)
(10
)
 
—

 
(46
)
 
(150
)
 
(206
)
Interest rate assets
15

 
—

 
—

 
—

 
15

Interest rate liabilities
—

 
—

 
(4
)
 
(6
)
 
(10
)
Total
47

 
86

 
(45
)
 
(154
)
 
(66
)
 
 
 
 
 
 
 
 
 
 
Designated as hedging contracts:
 
 
 
 
 
 
 
 
 
Commodity assets
1

 
—

 
2

 
3

 
6

Commodity liabilities
—

 
—

 
(14
)
 
(8
)
 
(22
)
Interest rate assets
—

 
8

 
—

 
—

 
8

Interest rate liabilities
—

 
—

 
(3
)
 
—

 
(3
)
Total
1

 
8

 
(15
)
 
(5
)
 
(11
)
 
 
 
 
 
 
 
 
 
 
Total derivatives
48

 
94

 
(60
)
 
(159
)
 
(77
)
Cash collateral receivable
—

 
—

 
13

 
61

 
74

Total derivatives - net basis
$
48

 
$
94

 
$
(47
)
 
$
(98
)
 
$
(3
)
 
(1)
The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of June 30, 2017 and December 31, 2016, a net regulatory asset of $162 million and $148 million, respectively, was recorded related to the net derivative liability of $83 million and $71 million, respectively. The difference between the net regulatory asset and the net derivative liability relates primarily to a power purchase agreement derivative at BHE Renewables.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts
The following table reconciles the beginning and ending balances of the Company's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions):
 
Three-Month Periods
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Beginning balance
$
180

 
$
253

 
$
148

 
$
250

Changes in fair value recognized in net regulatory assets
—

 
(49
)
 
33

 
(13
)
Net gains (losses) reclassified to operating revenue
1

 
(3
)
 
14

 
(3
)
Net losses reclassified to cost of sales
(19
)
 
(16
)
 
(33
)
 
(49
)
Ending balance
$
162

 
$
185

 
$
162

 
$
185
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)
The following table reconciles the beginning and ending balances of the Company's accumulated other comprehensive (income) loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in OCI, as well as amounts reclassified to earnings (in millions):
 
Three-Month Periods
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Beginning balance
$
23

 
$
72

 
$
16

 
$
46

Changes in fair value recognized in OCI
7

 
(28
)
 
23

 
20

Net losses reclassified to cost of sales
(9
)
 
(18
)
 
(18
)
 
(40
)
Ending balance
$
21

 
$
26

 
$
21

 
$
26
Schedule of Notional Amounts of Outstanding Derivative Positions
The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):
 
Unit of
 
June 30,
 
December 31,
 
Measure
 
2017
 
2016
 
 
 
 
 
 
Electricity purchases
Megawatt hours
 
11

 
5

Natural gas purchases
Decatherms
 
279

 
271

Fuel purchases
Gallons
 
5

 
11

Interest rate swaps
US$
 
694

 
714

Mortgage sale commitments, net
US$
 
(348
)
 
(309
)
PacifiCorp [Member]  
Derivative [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):
 
Other
 
 
 
Other
 
Other
 
 
 
Current
 
Other
 
Current
 
Long-term
 
 
 
Assets
 
Assets
 
Liabilities
 
Liabilities
 
Total
 
 
 
 
 
 
 
 
 
 
As of June 30, 2017
 
 
 
 
 
 
 
 
 
Not designated as hedging contracts(1):
 
 
 
 
 
 
 
 
 
Commodity assets
$
9

 
$
—

 
$
1

 
$
—

 
$
10

Commodity liabilities
(3
)
 
—

 
(22
)
 
(84
)
 
(109
)
Total
6

 
—

 
(21
)
 
(84
)
 
(99
)
 
 

 
 

 
 

 
 

 
 

Total derivatives
6

 
—

 
(21
)
 
(84
)
 
(99
)
Cash collateral receivable
—

 
—

 
15

 
58

 
73

Total derivatives - net basis
$
6

 
$
—

 
$
(6
)
 
$
(26
)
 
$
(26
)
 
 
 
 
 
 
 
 
 
 
As of December 31, 2016
 
 
 
 
 
 
 
 
 
Not designated as hedging contracts(1):
 
 
 
 
 
 
 
 
 
Commodity assets
$
24

 
$
2

 
$
1

 
$
—

 
$
27

Commodity liabilities
(6
)
 
—

 
(14
)
 
(84
)
 
(104
)
Total
18

 
2

 
(13
)
 
(84
)
 
(77
)
 
 
 
 
 
 
 
 
 
 
Total derivatives
18

 
2

 
(13
)
 
(84
)
 
(77
)
Cash collateral receivable
—

 
—

 
10

 
59

 
69

Total derivatives - net basis
$
18

 
$
2

 
$
(3
)
 
$
(25
)
 
$
(8
)


(1)
PacifiCorp's commodity derivatives are generally included in rates and as of June 30, 2017 and December 31, 2016, a regulatory asset of $95 million and $73 million, respectively, was recorded related to the net derivative liability of $99 million and $77 million, respectively.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts
The following table reconciles the beginning and ending balances of PacifiCorp's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions):
 
Three-Month Periods
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Beginning balance
$
103

 
$
144

 
$
73

 
$
133

Changes in fair value recognized in net regulatory assets
6

 
(45
)
 
30

 
(19
)
Net gains reclassified to operating revenue
1

 
2

 
13

 
10

Net losses reclassified to energy costs
(15
)
 
(12
)
 
(21
)
 
(35
)
Ending balance
$
95

 
$
89

 
$
95

 
$
89
Schedule of Notional Amounts of Outstanding Derivative Positions
The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):
 
Unit of
 
June 30,
 
December 31,
 
Measure
 
2017
 
2016
 
 
 
 
 
 
Electricity sales
Megawatt hours
 
(1
)
 
(3
)
Natural gas purchases
Decatherms
 
85

 
84

Fuel oil purchases
Gallons
 
5

 
11
Nevada Power Company [Member]  
Derivative [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The following table, which excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of Nevada Power's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):

 
 
Other
 
Other
 
 
 
 
Current
 
Long-term
 
 
 
 
Liabilities
 
Liabilities
 
Total
As of June 30, 2017
 
 
 
 
 
 
Commodity liabilities(1)
 
$
(3
)
 
$
(1
)
 
$
(4
)
 
 
 
 
 
 
 
As of December 31, 2016
 
 
 
 
 
 
Commodity liabilities(1)
 
$
(7
)
 
$
(7
)
 
$
(14
)

(1)
Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of June 30, 2017 and December 31, 2016, a regulatory asset of $4 million and $14 million, respectively, was recorded related to the derivative liability of $4 million and $14 million, respectively.
Schedule of Notional Amounts of Outstanding Derivative Positions
The following table summarizes the net notional amounts of outstanding derivative contracts with indexed and fixed price terms that comprise the mark-to-market values (in millions):
 
 
 
As of
 
Unit of
 
June 30,
 
December 31,
 
Measure
 
2017
 
2016
 
 
 
 
 
 
Electricity sales
Megawatt hours
 
—

 
(2
)
Natural gas purchases
Decatherms
 
123

 
114